They can have Anduin marry Tess Greymane but only for her to bear his child and secure + expand his kingdom while giving alliance more reason to get Gilneas back.
Then he can deny his wife any attention and pursue his true love Wrathion in an asexual relationship while developing a carnal relationship with Taelia by courting her with anecdotes of her father raising him
This kind of horrific writing is definitely in Golden's area of expertise